Calipers.



`IVI. W. SEVERANCE 6L C. C. HEBERT.

CALPERS.

l APFLlC-ATION FILED OCT. 7, 1915. A 'Lfl Patented May 9,19%.

narran stradine carenti* onirica MALVERN `W. SEVERANCE AND CONRAD C. HEBERT, 0F LOWELL, MASSACHUSETTS.

CALIPERS.

Specification of Letters Patent.

Patented May 9, 19155;

To all whom it may concern Be it known that we, MALvnnN XV. SEVER- ANCE and CONRAD C. HEBERT,- citizens of the United States. and residents of Lowell, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Calipers, of which the following is a specification.

Our invention relates to outside calipers, and the main object thereof is to provide such a tool which is adapted to receive and hold a rule in one of its legs whereby greater ease and accuracy of caliper adjust-- ment is possible than with the conventional calipers.

Our invention is fully described in theA following specification, of which the accompanying drawings form a part, in which like characters refer to like parts in each of the views, and in which Figure l is a side view of a caliper operatively engaged with a rule, one leg of the caliper being formed in accordance with our invention; Fig. 2 is an edge view of such leg; Fig. 3 is a view similar to Fig. 2 but showing a rule in position for use, said rule being shown in section; and Fig. i is an enlarged section taken on the line l-l of Fig. Q. l

In the drawmgs forming part of this application we have shown a caliper consisting of legs 5 and 6 p'ivoted together at 7, a spring S tending to force the free ends of the legs apart, and a. threaded rod 9 andnnt 10 holding the legs in adjusted positions against the action of the sprintr o The leg G has a longitudinal slbt l1 at vthe outer end thereof forming -two members l2 and 13 which normally bear upon each other at their outer ends in a resilient manner due to 'the' natural spring in the metal ofwhieh the leg is composed, and we chamfer the adjacent corners of the leg members l2 and 13, as shown at 14, to provide a guideway for the rule or scale l5 which is adapted to be forced between the leg members andv to lbe held therebetween by frictional Contactl therewith. y

As 1s well known, accurate adjustment of a'caliper to desired graduations on a scale is diliicult for the reason that the scale and caliper' are prone to slip over each other and thus move onepreviously placed leg away from the particular gra iuation on the scale before the other leg may be placed upon another desired graduation on the scale inl the operation of adjusting the legs with respect to each other. lith our caliper, however, the leg 6 is moved along the scale to the desired graduation with the legs spaced well apart. after which the nut 10 is rotated to force the legs toward eachl other until the end ofthe scale touches the leg 5, the desired caliper adjustment having thus been attained without the'necessity for attempting to keep the eyes on the two legs andihe scale at the same time, as with conventional calipers.

Our invention is very simple though highly efficient. overcomes the present veXations in caliper adjustments, saves considerable time. avoids eye st `ain. and is no more costly than the ordinary calipers.

vhile we have shown what we believe to be the most simple embodiment of our invention, we do not desire to confine ourselves thereto. but may make changes thereover, within the scope of the following claim, without departingT from the spirit of the invention or sacrificingr its advantages.

Having fully described our invention what we claim as new. and desire' to secur( by Letters Patent, is

A caliper provided with legs adjustabhwith respect to each other, one of said legi: being slotted to form two members adapte(v to frictionally hold a rule therebetween. amA said slot being outwardly fiared at one poin" to permit the introduction of a rrule betwce"` said members. to force the latter apart.

- In testimony whereof we have signed lur 

